Question 1066577
{{{x^2+2x-9=15}}}
{{{(x^2+2x+1)-9=15+1}}}
{{{(x+1)^2-9=16}}}
{{{(x+1)^2=25}}}
{{{x+1=0 +- 5}}}
{{{x=-1 +- 5}}}
{{{x=4}}} and {{{x=-6}}}